Cascade control method in SBR sewage treatment process

Abstract

The invention discloses a cascade control method and in particular relates to a cascade control method in an SBR sewage treatment process. The cascade control method comprises the steps: training a neural network model by adopting corresponding values of enough groups of known ammonia nitrogen, dissolved oxygen, temperature and flow in per cubic centimeter of sewage; establishing a mapping relation between an ammonia nitrogen value and a dissolved oxygen value in per cubic centimeter of sewage, and after finishing the weight training of the neural network model, calculating the corresponding ammonia nitrogen value in per cubic centimeter of sewage by virtue of the neural network model; and controlling the ammonia nitrogen value in per cubic centimeter of sewage in a biochemical reaction tank to be gradually close to the current ammonia nitrogen value in per cubic centimeter of sewage calculated by virtue of the neural network model by using the cascade control method until the ammonianitrogen value in per cubic centimeter of sewage in the biochemical reaction tank is same as the current ammonia nitrogen value in per cubic centimeter of sewage calculated by virtue of the neural network model. Energy saving is realized in an SBR sewage treatment process, the aim of optimizing the dissolved oxygen and ammonia nitrogen is achieved, and the cascade control method has a series of advantages such as high control precision and capability of achieving the aim of saving energy.

Description

technical field [0001] The invention relates to a cascade control method, in particular to a cascade control method in an SBR sewage treatment process. Background technique [0002] SBR is the abbreviation of Sequenced Batch Activated Sludge Process, which is an activated sludge sewage treatment technology operated by intermittent aeration. The core of SBR technology is the SBR reaction tank, which integrates homogenization, primary sedimentation, biodegradation, secondary sedimentation and other functions into one tank, without sludge return system. It is especially suitable for occasions with intermittent discharge and large flow changes. [0003] In the sewage treatment process, the concentration of dissolved oxygen affects the progress of the nitrification process and denitrification process, and the progress of the nitrification and denitrification process has a crucial impact on whether the sewage discharge can meet the standards. However, the control accuracy of the...

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Problems solved by technology

However, the control accuracy of the dissolved oxygen concentration in the SBR sewage treatment process at this stage is relatively poor

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